{
    "data": {
        "question": {
            "questionId": "355",
            "questionFrontendId": "355",
            "boundTopicId": null,
            "title": "Design Twitter",
            "titleSlug": "design-twitter",
            "content": "<p>Design a simplified version of Twitter where users can post tweets, follow/unfollow another user, and is able to see the <code>10</code> most recent tweets in the user&#39;s news feed.</p>\n\n<p>Implement the <code>Twitter</code> class:</p>\n\n<ul>\n\t<li><code>Twitter()</code> Initializes your twitter object.</li>\n\t<li><code>void postTweet(int userId, int tweetId)</code> Composes a new tweet with ID <code>tweetId</code> by the user <code>userId</code>. Each call to this function will be made with a unique <code>tweetId</code>.</li>\n\t<li><code>List&lt;Integer&gt; getNewsFeed(int userId)</code> Retrieves the <code>10</code> most recent tweet IDs in the user&#39;s news feed. Each item in the news feed must be posted by users who the user followed or by the user themself. Tweets must be <strong>ordered from most recent to least recent</strong>.</li>\n\t<li><code>void follow(int followerId, int followeeId)</code> The user with ID <code>followerId</code> started following the user with ID <code>followeeId</code>.</li>\n\t<li><code>void unfollow(int followerId, int followeeId)</code> The user with ID <code>followerId</code> started unfollowing the user with ID <code>followeeId</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;Twitter&quot;, &quot;postTweet&quot;, &quot;getNewsFeed&quot;, &quot;follow&quot;, &quot;postTweet&quot;, &quot;getNewsFeed&quot;, &quot;unfollow&quot;, &quot;getNewsFeed&quot;]\n[[], [1, 5], [1], [1, 2], [2, 6], [1], [1, 2], [1]]\n<strong>Output</strong>\n[null, null, [5], null, null, [6, 5], null, [5]]\n\n<strong>Explanation</strong>\nTwitter twitter = new Twitter();\ntwitter.postTweet(1, 5); // User 1 posts a new tweet (id = 5).\ntwitter.getNewsFeed(1);  // User 1&#39;s news feed should return a list with 1 tweet id -&gt; [5]. return [5]\ntwitter.follow(1, 2);    // User 1 follows user 2.\ntwitter.postTweet(2, 6); // User 2 posts a new tweet (id = 6).\ntwitter.getNewsFeed(1);  // User 1&#39;s news feed should return a list with 2 tweet ids -&gt; [6, 5]. Tweet id 6 should precede tweet id 5 because it is posted after tweet id 5.\ntwitter.unfollow(1, 2);  // User 1 unfollows user 2.\ntwitter.getNewsFeed(1);  // User 1&#39;s news feed should return a list with 1 tweet id -&gt; [5], since user 1 is no longer following user 2.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= userId, followerId, followeeId &lt;= 500</code></li>\n\t<li><code>0 &lt;= tweetId &lt;= 10<sup>4</sup></code></li>\n\t<li>All the tweets have <strong>unique</strong> IDs.</li>\n\t<li>At most <code>3 * 10<sup>4</sup></code> calls will be made to <code>postTweet</code>, <code>getNewsFeed</code>, <code>follow</code>, and <code>unfollow</code>.</li>\n</ul>\n",
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            "isPaidOnly": false,
            "difficulty": "Medium",
            "likes": 1932,
            "dislikes": 271,
            "isLiked": null,
            "similarQuestions": "[{\"title\": \"Design a File Sharing System\", \"titleSlug\": \"design-a-file-sharing-system\", \"difficulty\": \"Medium\", \"translatedTitle\": null}]",
            "exampleTestcases": "[\"Twitter\",\"postTweet\",\"getNewsFeed\",\"follow\",\"postTweet\",\"getNewsFeed\",\"unfollow\",\"getNewsFeed\"]\n[[],[1,5],[1],[1,2],[2,6],[1],[1,2],[1]]",
            "categoryTitle": "Algorithms",
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                    "name": "Design",
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                    "name": "Heap (Priority Queue)",
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            "codeSnippets": [
                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class Twitter {\npublic:\n    Twitter() {\n        \n    }\n    \n    void postTweet(int userId, int tweetId) {\n        \n    }\n    \n    vector<int> getNewsFeed(int userId) {\n        \n    }\n    \n    void follow(int followerId, int followeeId) {\n        \n    }\n    \n    void unfollow(int followerId, int followeeId) {\n        \n    }\n};\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * Twitter* obj = new Twitter();\n * obj->postTweet(userId,tweetId);\n * vector<int> param_2 = obj->getNewsFeed(userId);\n * obj->follow(followerId,followeeId);\n * obj->unfollow(followerId,followeeId);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class Twitter {\n\n    public Twitter() {\n        \n    }\n    \n    public void postTweet(int userId, int tweetId) {\n        \n    }\n    \n    public List<Integer> getNewsFeed(int userId) {\n        \n    }\n    \n    public void follow(int followerId, int followeeId) {\n        \n    }\n    \n    public void unfollow(int followerId, int followeeId) {\n        \n    }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * Twitter obj = new Twitter();\n * obj.postTweet(userId,tweetId);\n * List<Integer> param_2 = obj.getNewsFeed(userId);\n * obj.follow(followerId,followeeId);\n * obj.unfollow(followerId,followeeId);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class Twitter(object):\n\n    def __init__(self):\n        \n\n    def postTweet(self, userId, tweetId):\n        \"\"\"\n        :type userId: int\n        :type tweetId: int\n        :rtype: None\n        \"\"\"\n        \n\n    def getNewsFeed(self, userId):\n        \"\"\"\n        :type userId: int\n        :rtype: List[int]\n        \"\"\"\n        \n\n    def follow(self, followerId, followeeId):\n        \"\"\"\n        :type followerId: int\n        :type followeeId: int\n        :rtype: None\n        \"\"\"\n        \n\n    def unfollow(self, followerId, followeeId):\n        \"\"\"\n        :type followerId: int\n        :type followeeId: int\n        :rtype: None\n        \"\"\"\n        \n\n\n# Your Twitter object will be instantiated and called as such:\n# obj = Twitter()\n# obj.postTweet(userId,tweetId)\n# param_2 = obj.getNewsFeed(userId)\n# obj.follow(followerId,followeeId)\n# obj.unfollow(followerId,followeeId)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class Twitter:\n\n    def __init__(self):\n        \n\n    def postTweet(self, userId: int, tweetId: int) -> None:\n        \n\n    def getNewsFeed(self, userId: int) -> List[int]:\n        \n\n    def follow(self, followerId: int, followeeId: int) -> None:\n        \n\n    def unfollow(self, followerId: int, followeeId: int) -> None:\n        \n\n\n# Your Twitter object will be instantiated and called as such:\n# obj = Twitter()\n# obj.postTweet(userId,tweetId)\n# param_2 = obj.getNewsFeed(userId)\n# obj.follow(followerId,followeeId)\n# obj.unfollow(followerId,followeeId)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n    \n} Twitter;\n\n\nTwitter* twitterCreate() {\n    \n}\n\nvoid twitterPostTweet(Twitter* obj, int userId, int tweetId) {\n  \n}\n\nint* twitterGetNewsFeed(Twitter* obj, int userId, int* retSize) {\n  \n}\n\nvoid twitterFollow(Twitter* obj, int followerId, int followeeId) {\n  \n}\n\nvoid twitterUnfollow(Twitter* obj, int followerId, int followeeId) {\n  \n}\n\nvoid twitterFree(Twitter* obj) {\n    \n}\n\n/**\n * Your Twitter struct will be instantiated and called as such:\n * Twitter* obj = twitterCreate();\n * twitterPostTweet(obj, userId, tweetId);\n \n * int* param_2 = twitterGetNewsFeed(obj, userId, retSize);\n \n * twitterFollow(obj, followerId, followeeId);\n \n * twitterUnfollow(obj, followerId, followeeId);\n \n * twitterFree(obj);\n*/",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class Twitter {\n\n    public Twitter() {\n        \n    }\n    \n    public void PostTweet(int userId, int tweetId) {\n        \n    }\n    \n    public IList<int> GetNewsFeed(int userId) {\n        \n    }\n    \n    public void Follow(int followerId, int followeeId) {\n        \n    }\n    \n    public void Unfollow(int followerId, int followeeId) {\n        \n    }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * Twitter obj = new Twitter();\n * obj.PostTweet(userId,tweetId);\n * IList<int> param_2 = obj.GetNewsFeed(userId);\n * obj.Follow(followerId,followeeId);\n * obj.Unfollow(followerId,followeeId);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "\nvar Twitter = function() {\n    \n};\n\n/** \n * @param {number} userId \n * @param {number} tweetId\n * @return {void}\n */\nTwitter.prototype.postTweet = function(userId, tweetId) {\n    \n};\n\n/** \n * @param {number} userId\n * @return {number[]}\n */\nTwitter.prototype.getNewsFeed = function(userId) {\n    \n};\n\n/** \n * @param {number} followerId \n * @param {number} followeeId\n * @return {void}\n */\nTwitter.prototype.follow = function(followerId, followeeId) {\n    \n};\n\n/** \n * @param {number} followerId \n * @param {number} followeeId\n * @return {void}\n */\nTwitter.prototype.unfollow = function(followerId, followeeId) {\n    \n};\n\n/** \n * Your Twitter object will be instantiated and called as such:\n * var obj = new Twitter()\n * obj.postTweet(userId,tweetId)\n * var param_2 = obj.getNewsFeed(userId)\n * obj.follow(followerId,followeeId)\n * obj.unfollow(followerId,followeeId)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class Twitter\n    def initialize()\n        \n    end\n\n\n=begin\n    :type user_id: Integer\n    :type tweet_id: Integer\n    :rtype: Void\n=end\n    def post_tweet(user_id, tweet_id)\n        \n    end\n\n\n=begin\n    :type user_id: Integer\n    :rtype: Integer[]\n=end\n    def get_news_feed(user_id)\n        \n    end\n\n\n=begin\n    :type follower_id: Integer\n    :type followee_id: Integer\n    :rtype: Void\n=end\n    def follow(follower_id, followee_id)\n        \n    end\n\n\n=begin\n    :type follower_id: Integer\n    :type followee_id: Integer\n    :rtype: Void\n=end\n    def unfollow(follower_id, followee_id)\n        \n    end\n\n\nend\n\n# Your Twitter object will be instantiated and called as such:\n# obj = Twitter.new()\n# obj.post_tweet(user_id, tweet_id)\n# param_2 = obj.get_news_feed(user_id)\n# obj.follow(follower_id, followee_id)\n# obj.unfollow(follower_id, followee_id)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass Twitter {\n\n    init() {\n        \n    }\n    \n    func postTweet(_ userId: Int, _ tweetId: Int) {\n        \n    }\n    \n    func getNewsFeed(_ userId: Int) -> [Int] {\n        \n    }\n    \n    func follow(_ followerId: Int, _ followeeId: Int) {\n        \n    }\n    \n    func unfollow(_ followerId: Int, _ followeeId: Int) {\n        \n    }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * let obj = Twitter()\n * obj.postTweet(userId, tweetId)\n * let ret_2: [Int] = obj.getNewsFeed(userId)\n * obj.follow(followerId, followeeId)\n * obj.unfollow(followerId, followeeId)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type Twitter struct {\n    \n}\n\n\nfunc Constructor() Twitter {\n    \n}\n\n\nfunc (this *Twitter) PostTweet(userId int, tweetId int)  {\n    \n}\n\n\nfunc (this *Twitter) GetNewsFeed(userId int) []int {\n    \n}\n\n\nfunc (this *Twitter) Follow(followerId int, followeeId int)  {\n    \n}\n\n\nfunc (this *Twitter) Unfollow(followerId int, followeeId int)  {\n    \n}\n\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * obj := Constructor();\n * obj.PostTweet(userId,tweetId);\n * param_2 := obj.GetNewsFeed(userId);\n * obj.Follow(followerId,followeeId);\n * obj.Unfollow(followerId,followeeId);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class Twitter() {\n\n    def postTweet(userId: Int, tweetId: Int) {\n        \n    }\n\n    def getNewsFeed(userId: Int): List[Int] = {\n        \n    }\n\n    def follow(followerId: Int, followeeId: Int) {\n        \n    }\n\n    def unfollow(followerId: Int, followeeId: Int) {\n        \n    }\n\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * var obj = new Twitter()\n * obj.postTweet(userId,tweetId)\n * var param_2 = obj.getNewsFeed(userId)\n * obj.follow(followerId,followeeId)\n * obj.unfollow(followerId,followeeId)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class Twitter() {\n\n    fun postTweet(userId: Int, tweetId: Int) {\n        \n    }\n\n    fun getNewsFeed(userId: Int): List<Int> {\n        \n    }\n\n    fun follow(followerId: Int, followeeId: Int) {\n        \n    }\n\n    fun unfollow(followerId: Int, followeeId: Int) {\n        \n    }\n\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * var obj = Twitter()\n * obj.postTweet(userId,tweetId)\n * var param_2 = obj.getNewsFeed(userId)\n * obj.follow(followerId,followeeId)\n * obj.unfollow(followerId,followeeId)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct Twitter {\n\n}\n\n\n/** \n * `&self` means the method takes an immutable reference.\n * If you need a mutable reference, change it to `&mut self` instead.\n */\nimpl Twitter {\n\n    fn new() -> Self {\n        \n    }\n    \n    fn post_tweet(&self, user_id: i32, tweet_id: i32) {\n        \n    }\n    \n    fn get_news_feed(&self, user_id: i32) -> Vec<i32> {\n        \n    }\n    \n    fn follow(&self, follower_id: i32, followee_id: i32) {\n        \n    }\n    \n    fn unfollow(&self, follower_id: i32, followee_id: i32) {\n        \n    }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * let obj = Twitter::new();\n * obj.post_tweet(userId, tweetId);\n * let ret_2: Vec<i32> = obj.get_news_feed(userId);\n * obj.follow(followerId, followeeId);\n * obj.unfollow(followerId, followeeId);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class Twitter {\n    /**\n     */\n    function __construct() {\n        \n    }\n  \n    /**\n     * @param Integer $userId\n     * @param Integer $tweetId\n     * @return NULL\n     */\n    function postTweet($userId, $tweetId) {\n        \n    }\n  \n    /**\n     * @param Integer $userId\n     * @return Integer[]\n     */\n    function getNewsFeed($userId) {\n        \n    }\n  \n    /**\n     * @param Integer $followerId\n     * @param Integer $followeeId\n     * @return NULL\n     */\n    function follow($followerId, $followeeId) {\n        \n    }\n  \n    /**\n     * @param Integer $followerId\n     * @param Integer $followeeId\n     * @return NULL\n     */\n    function unfollow($followerId, $followeeId) {\n        \n    }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * $obj = Twitter();\n * $obj->postTweet($userId, $tweetId);\n * $ret_2 = $obj->getNewsFeed($userId);\n * $obj->follow($followerId, $followeeId);\n * $obj->unfollow($followerId, $followeeId);\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class Twitter {\n    constructor() {\n\n    }\n\n    postTweet(userId: number, tweetId: number): void {\n\n    }\n\n    getNewsFeed(userId: number): number[] {\n\n    }\n\n    follow(followerId: number, followeeId: number): void {\n\n    }\n\n    unfollow(followerId: number, followeeId: number): void {\n\n    }\n}\n\n/**\n * Your Twitter object will be instantiated and called as such:\n * var obj = new Twitter()\n * obj.postTweet(userId,tweetId)\n * var param_2 = obj.getNewsFeed(userId)\n * obj.follow(followerId,followeeId)\n * obj.unfollow(followerId,followeeId)\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define twitter%\n  (class object%\n    (super-new)\n    (init-field)\n    \n    ; post-tweet : exact-integer? exact-integer? -> void?\n    (define/public (post-tweet user-id tweet-id)\n\n      )\n    ; get-news-feed : exact-integer? -> (listof exact-integer?)\n    (define/public (get-news-feed user-id)\n\n      )\n    ; follow : exact-integer? exact-integer? -> void?\n    (define/public (follow follower-id followee-id)\n\n      )\n    ; unfollow : exact-integer? exact-integer? -> void?\n    (define/public (unfollow follower-id followee-id)\n\n      )))\n\n;; Your twitter% object will be instantiated and called as such:\n;; (define obj (new twitter%))\n;; (send obj post-tweet user-id tweet-id)\n;; (define param_2 (send obj get-news-feed user-id))\n;; (send obj follow follower-id followee-id)\n;; (send obj unfollow follower-id followee-id)",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec twitter_init_() -> any().\ntwitter_init_() ->\n  .\n\n-spec twitter_post_tweet(UserId :: integer(), TweetId :: integer()) -> any().\ntwitter_post_tweet(UserId, TweetId) ->\n  .\n\n-spec twitter_get_news_feed(UserId :: integer()) -> [integer()].\ntwitter_get_news_feed(UserId) ->\n  .\n\n-spec twitter_follow(FollowerId :: integer(), FolloweeId :: integer()) -> any().\ntwitter_follow(FollowerId, FolloweeId) ->\n  .\n\n-spec twitter_unfollow(FollowerId :: integer(), FolloweeId :: integer()) -> any().\ntwitter_unfollow(FollowerId, FolloweeId) ->\n  .\n\n\n%% Your functions will be called as such:\n%% twitter_init_(),\n%% twitter_post_tweet(UserId, TweetId),\n%% Param_2 = twitter_get_news_feed(UserId),\n%% twitter_follow(FollowerId, FolloweeId),\n%% twitter_unfollow(FollowerId, FolloweeId),\n\n%% twitter_init_ will be called before every test case, in which you can do some necessary initializations.",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Elixir",
                    "langSlug": "elixir",
                    "code": "defmodule Twitter do\n  @spec init_() :: any\n  def init_() do\n\n  end\n\n  @spec post_tweet(user_id :: integer, tweet_id :: integer) :: any\n  def post_tweet(user_id, tweet_id) do\n\n  end\n\n  @spec get_news_feed(user_id :: integer) :: [integer]\n  def get_news_feed(user_id) do\n\n  end\n\n  @spec follow(follower_id :: integer, followee_id :: integer) :: any\n  def follow(follower_id, followee_id) do\n\n  end\n\n  @spec unfollow(follower_id :: integer, followee_id :: integer) :: any\n  def unfollow(follower_id, followee_id) do\n\n  end\nend\n\n# Your functions will be called as such:\n# Twitter.init_()\n# Twitter.post_tweet(user_id, tweet_id)\n# param_2 = Twitter.get_news_feed(user_id)\n# Twitter.follow(follower_id, followee_id)\n# Twitter.unfollow(follower_id, followee_id)\n\n# Twitter.init_ will be called before every test case, in which you can do some necessary initializations.",
                    "__typename": "CodeSnippetNode"
                }
            ],
            "stats": "{\"totalAccepted\": \"82.8K\", \"totalSubmission\": \"241.8K\", \"totalAcceptedRaw\": 82793, \"totalSubmissionRaw\": 241845, \"acRate\": \"34.2%\"}",
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            "sampleTestCase": "[\"Twitter\",\"postTweet\",\"getNewsFeed\",\"follow\",\"postTweet\",\"getNewsFeed\",\"unfollow\",\"getNewsFeed\"]\n[[],[1,5],[1],[1,2],[2,6],[1],[1,2],[1]]",
            "metaData": "{\n  \"classname\": \"Twitter\",\n  \"constructor\": {\n    \"params\": []\n  },\n  \"methods\": [\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"userId\"\n        },\n        {\n          \"type\": \"integer\",\n          \"name\": \"tweetId\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"void\"\n      },\n      \"name\": \"postTweet\"\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"userId\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"list<integer>\"\n      },\n      \"name\": \"getNewsFeed\"\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"followerId\"\n        },\n        {\n          \"type\": \"integer\",\n          \"name\": \"followeeId\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"void\"\n      },\n      \"name\": \"follow\"\n    },\n    {\n      \"params\": [\n        {\n          \"type\": \"integer\",\n          \"name\": \"followerId\"\n        },\n        {\n          \"type\": \"integer\",\n          \"name\": \"followeeId\"\n        }\n      ],\n      \"return\": {\n        \"type\": \"void\"\n      },\n      \"name\": \"unfollow\"\n    }\n  ],\n  \"return\": {\n    \"type\": \"boolean\"\n  },\n  \"systemdesign\": true\n}",
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            "envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code> OpenJDK 17 </code>. Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\\r\\n\\r\\n<p>Note that Python 2.7 <a href=\\\"https://www.python.org/dev/peps/pep-0373/\\\" target=\\\"_blank\\\">will not be maintained past 2020</a>. For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu99 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n    int id;            /* we'll use this field as the key */\\r\\n    char name[10];\\r\\n    UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n    HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n    struct hash_entry *s;\\r\\n    HASH_FIND_INT(users, &user_id, s);\\r\\n    return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. Deleting an item in a hash:</b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n    HASH_DEL(users, user);  \\r\\n}\\r\\n</pre>\\r\\n</p>\"], \"csharp\": [\"C#\", \"<p><a href=\\\"https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\\r\\n\\r\\n<p>Your code is compiled with debug flag enabled (<code>/debug</code>).</p>\"], \"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\\r\\n\\r\\n<p>For Priority Queue / Queue data structures, you may use <a href=\\\"https://github.com/datastructures-js/priority-queue\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and <a href=\\\"https://github.com/datastructures-js/queue\\\" target=\\\"_blank\\\">datastructures-js/queue</a>.</p>\"], \"ruby\": [\"Ruby\", \"<p><code>Ruby 3.1</code></p>\\r\\n\\r\\n<p>Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms</p>\"], \"swift\": [\"Swift\", \"<p><code>Swift 5.5.2</code>.</p>\"], \"golang\": [\"Go\", \"<p><code>Go 1.17.6</code>.</p>\\r\\n\\r\\n<p>Support <a href=\\\"https://godoc.org/github.com/emirpasic/gods\\\" target=\\\"_blank\\\">https://godoc.org/github.com/emirpasic/gods</a> library.</p>\"], \"python3\": [\"Python3\", \"<p><code>Python 3.10</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/3/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/3/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/3/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. 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